Question 1

A shunt motor is typically used for railway installations, cranes, and other applications requiring high torque at low speed.

Accepted Answer

False

Question 2

Name two examples of applications that utilize DC series motors.

Accepted Answer

The DC series motor is often used for starter motors in automobiles and aircraft.
DC motors are used in forklifts and diesel electric locomotives.

Question 3

A series motor produces a greater torque than a shunt motor for the same increase in current.

Accepted Answer

A series motor has a higher starting torque and a greater torque increase with an increase in current, compared to a shunt motor. This is because the field winding and the armature winding are connected in series in a series motor, resulting in a larger current flowing through both windings, leading to a stronger magnetic field and hence more torque production.

Question 4

The direction of ____________________ may be reversed by changing the direction of the current either in the series field or the armature.

Accepted Answer

The answer of The direction of ____________________ may be reversed...

Question 5

Figure 02-2
 
-What accounts for the flattened slope of the speed torque curve of the series motor in the accompanying figure?

Accepted Answer

The answer of Figure 02-2
 
-What accounts for the flattened...

Question 6

When a mechanical load is added to the series motor, the motor slows with a new, higher torque requirement.

Accepted Answer

When a mechanical load is added to the series motor, the motor slows down as more torque is required to overcome the resistance of the load. As a result, the motor generates a higher torque to match the new load requirement.

Question 7

The series motor maintains a constant speed as mechanical load is added.

Accepted Answer

The statement is incorrect. A series motor's speed decreases as mechanical load is added.

Question 8

The speed regulation of a line-connected series motor is inherently better than that of a shunt motor.

Accepted Answer

The speed regulation of a shunt motor is inherently better than that of a series motor, as the shunt motor has a more stable speed-torque characteristic. The speed of a series motor decreases significantly as the load increases, while the speed of a shunt motor remains relatively constant.

Question 9

Briefly describe the effects of a reduction of a load on the speed of a DC series motor.

Accepted Answer

The answer of Briefly describe the effects of a reduction...

Question 10

Name three of the four characteristics used in rating series DC motors.

Accepted Answer

The answer of Name three of the four characteristics used...

Question 11

Draw the basic connection circuit of a series DC motor.

Accepted Answer

The answer of Draw the basic connection circuit of a...

Question 12

The DC series motor has very high starting torque at very low _______________________.

Accepted Answer

The answer of The DC series motor has very high...

Question 13

A series motor produces a greater ____________________ than a shunt motor for the same increase in current.

Accepted Answer

The answer of A series motor produces a greater ____________________...

Question 14

In a series motor, any increase in load causes an increase of ____________________ in both the field and armature circuits.

Accepted Answer

The answer of In a series motor, any increase in...

Question 15

A(n) ____________________ motor is used as a traction motor because of its capability to produce a high torque with only a moderate increase in power at reduced speed.

Accepted Answer

The answer of A(n) ____________________ motor is used as a...

Quiz 2: The DC Series Motor